Question

write the symbol and valency

1 hydrogen ----------- ------------
2 aluminum ---------- -----------
3 copper ----------- -----------
4 bromine --------- -----------

Answer 1

symbol valency
1. H 1
2. Al 3
3. Cu 2 (occasionally 1)
4. Br 1

Answer 2

elements. valency

symbol

H. 1

Al. 3

Cu. 2 or 1 isotope

Br. 1